Maybe i'm wrong, but your opponent asked for the game to be extended earlier on due to him flying in the weekend (and his game also got extended last week, so you had also less time to play). I told you guys that it is fine and you also agree with it. Then he tried to schedule for something in the range from monday-wednesday next week, but you asked him to play on saturday, which he explained he cannot do. So he asked again when you want to play in the extension range and then you told him you can play monday. Then he asked what time you can play, your timezone and if you can play tuesday as well but you told him that weekends and tuesday are terrible for you (but you never responded to what time you can play on monday).
So looking at this it seems like you guys should be able to find a time on monday, but i might be wrong. I'm unsure what the act call would be currently if you can't find a time tho.